To learn more about ports check out this video: kzbin.info/www/bejne/o3m3eKp7fah2iNE
@DIYAudioGuy2 жыл бұрын
@nate0 both sound fishy to me. I wouldn't have any idea how to test either.
@DIYAudioGuy2 жыл бұрын
I wonder how many speakers get de-magnetized sitting in a pallet since they are all close together.
@rollme1kenobi8932 жыл бұрын
Have you had the opportunity to check out any of the latest earthquake car audio. I loved them back in the early 90's, amps &subs. I was wondering if there current specs were real. 3.5 inch of x-mass for a 10 inch sub on 750 rms. 20hz for there 6x9's. Videos I've seen for the subs kind of look fake,or a science project gone wrong. Just wondering? Thanks in advance!
@poncethegayboi6 ай бұрын
I was going to say. Klipsch
@25hztolife142 жыл бұрын
Big fan of passive radiators. My floor Speakers consist of 2 active 8s and 2 passive radiators with a soft Dome. Super loud and very, very good Bass.
@DIYAudioGuy2 жыл бұрын
Cool!
@TEPL1 Жыл бұрын
Are they in the same enclosure by chance?
@DaVe-iSnOtHoMe.MaN.LemmingsWeB Жыл бұрын
Lol i went all out 1st time. Twin 15's powered an 3 high xmax 12's as passive in a extended cab f150. Lol i needed 1 more 12 passive..lol
@Carl_Jr2 жыл бұрын
I had to laugh when you were talking about port length in small enclosures. I've been caught in that conundrum. The issue is, once you make the port longer, since it occupies space inside the enclosure making it longer makes the enclosure smaller as well. It's a never-ending cycle. 🤣
@DIYAudioGuy2 жыл бұрын
I was laughing the entire time too because I kept visualizing Michael Scott from the office saying That's what she said. But seriously, you're exactly right.
@Carl_Jr2 жыл бұрын
@@DIYAudioGuy I've never seen that show but I've said that "quote" plenty of times. LoL You did a great job on this video! *Applause* 👏 Just one small suggestion. Put a sticker on your phone or camera or whatever you use, which points at the actual lens and reads "Look here!" to remind you to look at the actual lens. 😎 I see a lot of KZbinrs looking slightly "off point" and it's distracting. Not quite as bad as looking at someone with a stray eye, wondering if they're actually looking at you or not, but close. 🤣
@DIYAudioGuy2 жыл бұрын
@@Carl_Jr Believe it or not, I've gotten a whole lot better at that! I think what I need to do is frame the shot and then fold the LCD screen away.
@casemods2 жыл бұрын
Do port outside 😏
@janinapalmer83682 жыл бұрын
You either use a simulation program and determine all the design parameters or you make a variable volume box and stick the port outside the box ... use this for measuring the performance and plot the SPL and when you're happy with the results then you make your box ( allowing for the port volume of course)
@djijspeakerguy46282 жыл бұрын
It seems many people do not even know what a passive radiator is, so thanks for making this video. Some floor standing speakers, including the Polk t50, have been using passive radiators, and many people think that they are special bass speakers that have a magnet and should be wired up. They then notice their speaker is lightweight and take the “driver” out, discovering that they have a “fake speaker,” not really realizing that they were looking at a passive radiator. This has now caused more than two 1 star reviews for the t50 on Amazon.
@DIYAudioGuy2 жыл бұрын
I made the same mistake, I literary thought companies were trying to scam me.
@drrock53562 ай бұрын
I have 2 Skar SVR-12's in a 2.6 Cu Ft sealed enclosure in the trunk, fed with a firm 1,000 watts, and they sound great, down to about 40 hz. I recently added 2 Slaps M12V2 passive radiators, with 500g total ballast on the back of each, and now the bass goes down to 19 hz! When fed pure sine waves, at both 23 and 26 hz the entire car resonates violently, and begins to self destruct. Yet the midbass still sounds great!
@ParkerTheBasshead2 жыл бұрын
You are the best at fully explaining in a way that is easy to understand! Thanks for the great content!
@DIYAudioGuy2 жыл бұрын
Hey man I really appreciate that!
@KidCoyle2 жыл бұрын
@@DIYAudioGuy Parker is right. There is an enormous amount of startlingly easily-digested material in this video. Well done. Thank you.
@DIYAudioGuy2 жыл бұрын
@@KidCoyle That seems to be my niche.
@Satch_4_Hogs2 жыл бұрын
interesting to play with PR's. In my experience, with a low tuned PR, the higher frequencies do not cause the PR to resonate nearly as much. This seems to create a situation where frequencies close to the tuning frequency the enclosure reacts more like a ported box. The further away, the enclosure acts more like a sealed box. so, in my experience, you can get the best of both worlds. Increased output at low frequencies, with tighter response at higher frequencies. The radiator does need to be properly set up with turning/mass.
@DIYAudioGuy2 жыл бұрын
For sure
@bojow81022 ай бұрын
BudgetBassHead has a couple of really good box builds on his channel using passive radiators.
@DIYAudioGuy2 ай бұрын
Yeah, I watch his stuff.
@TRONMAGNUM20992 жыл бұрын
Good video. Do you remember the FX95's from Kraco? They had like a 6 inch woofer and a 8 inch passive radiator with a tweeter on top. Back in HS that is what people started with. My friend had them behind his front seats in his Chevy Monte Carlo. With a 140 watt Jensen amp. They were pretty loud and sounded good enough back then. So passive radiators get a thumbs up in my book.
@DIYAudioGuy2 жыл бұрын
I don't remember that specific piece of gear but I certainly remember a Kraco! You must be an old timer like me?
@303nitzubishi42 жыл бұрын
I do remember those and I just saw a pair at a thrift store not too long ago! Unfortunately the foam surrounds had started deteriorating and they were asking a bit much so I passed on them
@dylanandersen93182 жыл бұрын
I've been super curious about a passive setup due to the space constraints in my car. Was worried that it might not sound as good as ported and wasn't sure about how to implement it. I'm definitely going to give it a shot now.
@DIYAudioGuy2 жыл бұрын
It is a cost vs space trade off, plus the passive will roll off faster on the low end. Forget to mention that in the video. Will probably need to make another one showing that.
@dylanandersen93182 жыл бұрын
@@DIYAudioGuy So, you would need to tune lower to compensate?
@DIYAudioGuy2 жыл бұрын
Probably not.
@dtibor59032 жыл бұрын
I use a Kicker 12 inch sub in my car. I love how little space it takes up. It is louder than my older sealed box. The pr tuning from the factory is 44-45hz, wich is not that low and I missed that powerful kick in the lungs from the sealed box. So I added weight to the pr to tune it lower a bit to about 38Hz. I used some silicone on the back of pr as weight. Like this it is just perfect.
@dtibor59032 жыл бұрын
@@dylanandersen9318 depends a lot on the box volume. If the box volume is larger you may end up with pr tuned already below 30 hz. Ideally for a car sub I would suggest a pr tuning to 40-35hz but that is my preference.
@1toonhead2 жыл бұрын
I have a passive radiator on my person extreme hi-fi unit. In one box I get 20 to 20 000 coming out on one amp. To get the passive that low I use a small dinner plate on the cone to add stiffness and weight to get the tuning. It has blown alot of people away of how it work. The 20 hert note can be heard a long way away. Been a fan of them for many years.
@DIYAudioGuy2 жыл бұрын
Damnnnn! Hit those nasty lows!
@Randy_G2 жыл бұрын
You do such a great job at explaining audio topics.
@DIYAudioGuy2 жыл бұрын
That is the goal.
@rosco46592 жыл бұрын
Pioneer put passive radiators in some of there speakers, we had a pair in the common room (bar) of our barrack block. This was in 2001, I think the speakers were from the 80's and had been passed around between soldiers for years.
@luc57316 ай бұрын
Earthquake had the best ones back in the day. Technique used them in home audio in the 70s n 80s.
@ShredRMK8246 ай бұрын
Earthquake still makes the SLAPS Series PRs. I run one with a 12 inch sub. Once tuned it increases the box output like a port.
@Luminous.Dynamics2 ай бұрын
@@ShredRMK824 So my pop has a regular cab pick up truck. We're taking out 3 Kicker Comp c10s and he wanted just 2 Kicker CVR 10". The enclosure behind the seat is sealed and was made for three 10" Could I just use a single Kicker CVR 10" and get two of these passive radiators, or should it be one per sub? In which case I could just cover up the middle hole, and do a CVR 10" and a passive radiator on the other side?
@ShredRMK8242 ай бұрын
@Luminous.Dynamics Use as big as a Passive radiator as the space will allow. I like to do an extended bolt out the front so I can easily change the mass without removing the PR. That allows me to tune it much quicker. Yes you can use 2 PRs it's best to have more PR cone surface area than the active drivers. The larger the PR the lower you'll be able to tune the box. Ideally if you can run 2 active 10s and a 15PR the box would have a wide dynamic range.
@Luminous.Dynamics2 ай бұрын
@@ShredRMK824 If I could, I would, but the box is already made and he doesnt want a different one. I was gonna just port the box with PVC pipes since theres enough airspace and just run the two CVR 10" but I think I can have him try a single 10" with one PR, although I think the box might be too big for a single 10" subwoofer. Kicker recommends 0.8-3.0 cu. ft. per sub sealed for the 10" but I dont know how factual that info is, up to 3.0 for a sealed 10" seems crazy. Thinking it should be okay though as his enclosure isnt even 2 cu ft total.
@ShredRMK8242 ай бұрын
I'd rather do the PR than port it. To me a small ported box sounds very muddy and you need to carefully measure for the correct port. You will need all the theile small parameters to acheive that. If you substitute one 10 PR and put a good amount of mass on it to lower the frequency you should be good. Generally I believe the 10 PRs are around 45hz with no weight on it.
@Chrick Жыл бұрын
The best thing to have 2 Passive radiators, stroke for example one one right side and one on the left side of the box is vibration cancelation of the box, specially with hevy mass on the passive radiators, for home theathre as an example, i have experimented alot with this and i can just say, they are great, with right amount of dampfaktor and headroom of the amplifier. great video by the way, it explaines all the facts.... 🙂
@Skarfar903 ай бұрын
Passive radiators are awesome. If you want good bass, but don't have the space for a large ported box, PR's will be the best bet. I like how you get the good, smooth sound of a sealed box, with the higher output of a ported box. About myth #2 - You need two PR's if the specs are identical to that of the active driver (same parameters). Otherwise, use the formula
@HifiVega2 жыл бұрын
Great video Justin! They keep getting better every week
@BabyCharlotteschannel2 жыл бұрын
I'm not just an audiophile, but I am a technical reading geek as well, so I'm a big fan of Justin and your videos! Thank you both for helping me to learn how to get the most of every single build I do.
@DIYAudioGuy2 жыл бұрын
I appreciate that.
@DIYAudioGuy2 жыл бұрын
Thanks Rob!
@HashDogg062 жыл бұрын
Yes absolutely. I find Justin to be very engaging in his videos which makes me come back for more & his editing is great, there is never a moment i am bored.
@markfischer36262 жыл бұрын
The model most appropriate for understanding woofer/enclosure mechanical performance is Newtons second law of motion applied to forced oscillation. This is an ordinary second order differential equation. Three factors affect the FR insofar as resonant frequency an Q are concerned. There's mass, springiness, and velocity related frictional loss which control the damping factor. There are two problems here as I see it. One is that you have no control over Q, the damping factor. Typically ported designs and passive designs will have a high Q. Ideal is 0.707. The other problem is that the passive is 180 degrees out of phase with the main woofer.
@Harvy5002 жыл бұрын
Rel T7i subwoofers have 1 front firing 8" active driver and 1 downwards firing 10" passive driver. I've got 2. I got them a couple of months ago to upgrade my Rel T5i subwoofers. The T5i subs use a single downwards firing 8" active driver. To say the T7I'S are better is a huge understatement! Passive rads do an amazing job!!
@ganck1147 Жыл бұрын
Yes the T7i is an awesome compact sub. I use them for music & movies & they fill up my 15ft X 18ft room effortlessly.
@speedwayaudio32 жыл бұрын
Back in the late 80's I had a Kicker Full range Box with 2 10's and a 12-inch passive radiator in the center with two tweeters on top.
@DIYAudioGuy2 жыл бұрын
Sweet! I wish I had some pics of some of those old enclosures. I would have included them in the video.
@speedwayaudio32 жыл бұрын
@@DIYAudioGuy I was 23 at the time and I was the sh*t.
@gakudzu72822 жыл бұрын
I saw one of those once. ONCE, lol. It was damn sweet. I'm also old enough to remember when the Kicker Sidekicks came out in the early-mid '80s. 6 1/2" woofer w/8" passive and top-mount tweet. The cool kids driving old trucks could finally hear their music over their exhaust.😄
@davidlewis81242 жыл бұрын
Pioneer came out with some too that was TX x or something had one PR and one active driver and that was kind of an a plastic enclosure. Kicker had a Camaro box for their hatch at two horn tweeters either two 6.5" or 8" subwoofers and on the back of the box had two 10" and or 12" PRs. They were very impressive.
@speedwayaudio32 жыл бұрын
@@gakudzu7282 Also back in those days the Jensen Tri-ax 6x9's were king of the hill. if you did not have them, you wanted them. before I had my truck with the kicker box I had a 74 Camero with 2 EQ/Boosters and 8 Jenson's. It was very bad ass for those times.
@JDfromWitness2 жыл бұрын
Sometimes they can be found on large rigs as well. I have a pair of Intersonics ServoDrive ContraBass subs that each use two 15's as driven speakers and two 18 inch passive radiators.
@DIYAudioGuy2 жыл бұрын
Very true.
@jcweiz09 Жыл бұрын
i've never heard of a 15inch speaker with 2 18inch passive radiators. It should sound great. What I like about enclosures with passive radiator is that it sounds cleaner without the annoying port noise.
@ImpulseAudioSpeakers2 жыл бұрын
Awesome video. Perfect and easy to follow for anyone wanting to understand passive radiators.
@DIYAudioGuy2 жыл бұрын
Thanks!
@swedebug28892 жыл бұрын
I built a sub with a 12" driver and 2x10" passive radiator. With the right weights on the passive radiators it sounds very good for being DIY. :)
@DIYAudioGuy2 жыл бұрын
Awesome!
@PartsExpressOfficial2 жыл бұрын
Great Video! Thanks for sharing your knowledge!
@DIYAudioGuy2 жыл бұрын
Glad to do it.
@davidlewis81242 жыл бұрын
This video is the Best one I've ever seen on PR . I have a Definitive Technology super Cube 8000 it's a beast. It punches hard and digs deep very low. And it blends perfect with ported subwoofers or sealed subwoofers. Keep teaching us more and more. Thanks for all the hard work you do. ✌️❤️
@trucker80842 жыл бұрын
Kicker back in the day had a behind the seat box made for an S10 that had two six and a half inch woofers and a 10-in passive radiator and you would swear that you had two 12s behind the seat of that truck..
@njhampster2 жыл бұрын
So those Panasonic Thrusters I had back in '77 were no joke! lol Very concise explanation
@DIYAudioGuy2 жыл бұрын
Awesome!
@westreadwell96752 жыл бұрын
Best port explanation I’ve ever heard and I’ve been in it for nearly 20 years!
@DIYAudioGuy2 жыл бұрын
Thanks!
@jamesfalvey77 Жыл бұрын
One problem I have is having a project in mind, and like the rest of the world, I turn to KZbin for some more information. Then coming across videos like this, no offense, there's so much technical jargon that it ultimately drives me away from the project. Justin, you are very informative. Thanks for what you do
@DIYAudioGuy Жыл бұрын
I may need to make a video explaining the jargon.
@RWB123 Жыл бұрын
Great overview on passive radiators 👍
@PhilLesh692 жыл бұрын
I once had a custom made 4th order bandpass ported enclosure where we calculated low frequency wavelengths to determine the length of the internal port tube. It took one 8 inch driver and was able to handle about 400 watts.
@DIYAudioGuy2 жыл бұрын
Cool.
@Stan_the_Belgian2 жыл бұрын
Very clear vid, I'm also building a sub with 2 12" actives and a 18" pr, expensive but the only way to make it work without making a huuuuuge box
@DIYAudioGuy2 жыл бұрын
That sounds pretty cool!
@Rowuk2024Ай бұрын
I understand that you are trying to make a complex subject more simple, but the problem with ports AND passive radiators is that the port/radiator ONLY resonates at the tuning frequency. As that is a low frequency, more air is moving BUT not necessarily the frequency that the music is asking for. Put an accelerometer on a passive and check what the cone is actually doing. The technical description is Helmholz resonator. This is why I do not use ports or passives. My test was a port tuned to 40 Hz and the loudspeaker got fed 50 Hz. Both 40Hz and 50Hz were measurable in the listening area - hardly a goal for someone interested in sound quality. I will not go into why most people do not hear this. Only sealed boxes or open baffle are free from this effect at bass frequencies.
@DIYAudioGuyАй бұрын
Interesting. Definitely something I might need to look into.
@grantcain97172 жыл бұрын
I've been waiting for you my whole life. Great vidz.
@DIYAudioGuy2 жыл бұрын
More to come!
@NackDSP2 жыл бұрын
First instinct was right. High Fidelity by definition doesn't include adding a resonance to a system. A resonator doesn't reproduce the signal, it creates a ring tone when it gets excited. Can you imagine adding a tuning fork to get more midrange? No. I gave up on resonant bass systems when I heard my first well designed sealed woofer system. If you have room for a passive radiator, spend a little more and just add a second woofer. My buddy built a system with two 10" woofers per side this fall. It is bass perfection. With proper equalization like a Linkwitz transform you can have all the clean deep bass that the radiator promises but doesn't deliver. People don't realize the transient response of these systems is bad. It takes a few cycles of the base note for the resonator to build up amplitude and you miss out on initial transient peak that a sealed system readily reproduces. Drum and plucked bass leading edges get cut in half. The transient frequency response of a ported system doesn't include any output from the port. Only a sealed system will produce the same frequency response for the transient and the steady state. This is what is called "fast bass". Ports and Radiators will always be slow muted transient bass by design with resonant overhang that was never in the music.
@Grommet20072 жыл бұрын
Um, sealed systems are also resonant systems. If they were not, their impedance curve would be dead flat :-)
@NackDSP2 жыл бұрын
@@Grommet2007 Sure, sealed systems, that act as a spring, mass and damper, can be resonant systems, but they don't have to ring. If your sealed system has a low Q, like 0.5 or 0.7, it has little or no over shoot, and it doesn't ring like a bell like a passive radiator or a port must do to produce sound. A sealed woofer system can actually reproduce a bass waveform accurately because it doesn't ring. Go look at a five cycle tone burst of a woofer system with a Qb of 0.5. It doesn't resonate. It tracks the signal. Adding a resonator to a well damped woofer system is just a bad idea, and isn't high fidelity.
@Grommet20072 жыл бұрын
@@NackDSP Very few people build sealed systems with a Qb of 0.5, because the boxes tend to be large and the power handling at low frequencies is usually pretty crappy. In any case, put any of these bass systems in your average room and you will have to deal with very high Q resonances caused by the room's dimensions anyway.
@Durolith2 жыл бұрын
SMD have made nice shop speakers with 2 18'' box 3 passive in each box damn amazing setup
@DIYAudioGuy2 жыл бұрын
Yes, I remember when he built those.
@Skarfar902 жыл бұрын
The "SMD Towering Towers" I too remember when he built them, and tested them out. Crazy output from a relatively small sub enclosure. By the way, he had two passive radiators per 18" driver, not three.
@memelorddavid29382 жыл бұрын
We need shirts that say "Moon the Cone" 🤣🤣🤣
@DIYAudioGuy2 жыл бұрын
Heck yeah! I'm thinking a big subwoofer where the speaker cone is some butt cheeks.
@s.knight59912 ай бұрын
There's almost no information on KZbin about aperiodic vents in bass cabinets although they can be a very useful alternative for ports or passive radiators. I think it would be a good idea to make a video about that option.
@xaphanofthenightfall1257 Жыл бұрын
dunno about "moon" but @ 9:38 "the notification BILL"
@Edward135i2 жыл бұрын
I don't understand why passive radiators aren't more popular. They are basically ports that can't chuff.
@DIYAudioGuy2 жыл бұрын
Cost, they can be expensive.
@TEPL1 Жыл бұрын
Quick question: I have a sealed box for two 8" CompRTs, and I'm thinking about adding two 8" passive radiators to it to add a little extra something. Two questions: 1) Since the subs are on the face of the box, could I mount the PRs on the sides? 2) Are there any cons to adding two PRs to a box with two active subs? I feel like I've only seen the 1 and 1 configurations.
@DIYAudioGuy Жыл бұрын
The kicker passive radiators are designed to match with their RT line of speakers. I think there's a link to them in their product description. As long as you got the air space matched up with what kicker recommends you should be just fine adding two of their passive radiators to that enclosure. They designed their passives to have more cone travel so you can do one passive per active.
@ShredRMK8246 ай бұрын
Usually if you don't have room in the front baffle I read somewhere to mount them in the back personally I'm not sure if it matters since they are not active so standing waves shouldn't be an issue.
@djijspeakerguy46282 жыл бұрын
Did you know, small passive radiators are often not cone shaped, neither do they contain a spider? They are often just weighted pieces of metal with a rubber surround, as seen in most portable speakers these days. JBL, Bose, Sony, and others are using them in their Bluetooth speaker lines.
@DIYAudioGuy2 жыл бұрын
PS Audio uses MDF for PR cones because they need a lot mass to get the desired tuning.
@ponce5382 жыл бұрын
I run a pair of Polk MXT-60s, floor speakers with 2 PRs per speaker. Sound is great, and without using my subwoofer for streaming Hi-Res music. Sound is clean and deep, depending on the track. I only use my sub for movies and TV content.
@xxxYYZxxx Жыл бұрын
So Cal audio fans may recall the RSL Titan model, which featured a 15" PR, 12" woofer, 8" mid woofer, 5" mid & 2" horn tweeter, plus 2 L-pads, arranged somewhat haphazardly onto a giant box. I like the Titan, and think an upgraded version with modern drivers and a symmetrically opposed layout should exist, perhaps with a built-in powered sub.
@justinfoxbody7 ай бұрын
Klipsch has been using passive radiators for years. The fort’e ii speaker has an active 12 inch driver and a passive 15 inch.
@brianraulerson50372 жыл бұрын
Thanks, Justin! You taught me something! Between you and Nick I just might end up smart.
@DIYAudioGuy2 жыл бұрын
Glad to help.
@SecretMailBand6 ай бұрын
Absolutely great explanation! Even I (as a german - english is not my native language) understood (or not?) your very interesting videos - great!
@DIYAudioGuy6 ай бұрын
Thank you! 😃
@JoshM72 жыл бұрын
The beginning of the video reminded me of a review I've seen on Amazon of a Polk Audio Floorstanding speaker that used passive radiators and the reviewer was angry he got 2 "fake" speakers. It was the Polk T50 I believe.
@DIYAudioGuy2 жыл бұрын
🤣
@joeylopez88212 жыл бұрын
Immediately thought of the same review. The guy was warning others not to buy because they are scamming people with fake speakers.
@justinnaramor60502 жыл бұрын
@@joeylopez8821 And then people probably were talking to the guy after the review, saying those are passive radiators. It would probably go something like this: Reviewer: "Don't buy this, the company is scamming us by using fake speakers!" People in the comments: "Lol, unfortunately you're wrong. Clearly you've never heard of a passive radiator." Or something like that. It's so silly how people immediately jump to conclusions of something being fake, instead of educating themselves on something they don't understand! It would be like saying "this person playing bagpipes is faking the performance because he takes a breath and the sound of the music is uninterrupted!" Lol! I'm not the type of person who just jumps to wrong conclusions like this... I prefer to educate myself on something I don't yet know about.
@rawux12289 ай бұрын
well some plywood can be also costly to build a long port, so pr can save you from big box and complex design. And no more farts from port.
@josephlalock83782 жыл бұрын
i'm a fan of passive radiators. i had a pair of acculab floor speakers years back that had a 12" passive in each box. basically just a cloth covered styrofoam disk with a foam surround and no spider or even basket for that matter. very cheaply built speakers by todays standards but they sounded great! built by rtr probably about they time rtr was on the way down. i've also designed and built a small sub utilizing dual radiators that digs extemely deep for its size and i just got a package for a set of bench speakers that will each have a 7" radiator. polk used passive radiators in lots of their designs in the 80s that dug plenty deep too. one thing that i do want to mention tho, about ports. there is nothing that says you have to put a long port inside a small box. it can be on the outside. whether you want to wrap a slot port around the enclosure or do something funky with a pvc pipe. as long as the calculations are right, the tuning will be right. good video tho dude.
@DIYAudioGuy2 жыл бұрын
You are absolutely right! The port does not have to be inside the box! I've had several viewers ask about the implications of having a port opening that was a long distance away from the subwoofer. I'm going to have to research that into a video on it.
@josephlalock83782 жыл бұрын
@@DIYAudioGuy cool. i'd like to see the results. that being said, i always learned that the driver and port should be as close as possible for optimum results. but then i will add to the argument of drivers on front, ports on rear. group delay, phase delay. how much can you hear, can you incorporate it optimally for your listening space...personally, i want forward firing everything and in close proximity. but i dont think a port a long distance from the driver would matter in the trunk of a car. that being said, a "stand mount" speaker who's stand is the port, exhausting at the floor in any direction, could work. that is on my to-do list one day, maybe...
@DIYAudioGuy2 жыл бұрын
@@josephlalock8378 Right! In room/car response is a completely different beast. Plus low frequencies have long wavelengths. So many variables!
@gtarbmx Жыл бұрын
I have bic American hifi speakers with 2 woofers and 2 radiators of equal size. They're my favorite sounding speakers. The bass response is very linear and tight
@TimpBizkit Жыл бұрын
I had a set of vintage KEF with passive radiators but the bass was fairly flabby, although was still somewhat fun to listen to.
@briannicolai92762 ай бұрын
On the right day I'd buy a hat from you..
@thinkIndependent2024 Жыл бұрын
Thanks for being someone who goes with FACTS
@DIYAudioGuy Жыл бұрын
Facts are fun.
@rhuttrho886 ай бұрын
I forgot about them damn things. I don't know if I ever heard a box, though. 🤔
@AndxRev2 жыл бұрын
Excellent explanation!
@DIYAudioGuy2 жыл бұрын
Thanks
@BoDiddly Жыл бұрын
I had passive radiators in my Kenwood LS-P9000HG home speakers in my barracks when I was stationed in Okinawa (1988/89). I still have those speakers, but the foam around the radiator and the 10" active have long deteriorated. I replaced the 10" one time long ago, but I haven't found a replacement for the 430mm radiator, so I have been considering making some.
@DIYAudioGuy Жыл бұрын
Would this work: parts-express.sjv.io/5b2Wno
@BoDiddly Жыл бұрын
@@DIYAudioGuy That might actually work! The speakers were advertised as 18" passive radiator, but the actual specifications say 430mm which turns out to be 16.9 baffles.
@visionsofpromise2 жыл бұрын
I'll take a port over a passive radiator. That way I'm not disappointed when I look at it expecting an actual speaker
@DIYAudioGuy2 жыл бұрын
🤣. It's funny because it's true!
@garychandler4296 Жыл бұрын
Funny story: back in the '70s, I'd found 2 15" Marantz speakers atthe dump, blown I discovered. I took them and put them in 2 24" cardboard boxes and mounted an 8" car speaker on the other side of each, thinking it would magnify the bass I knew comes from the back of speakers. Hooked them up to my home stereo and man, did they sound good! I'd invented the kicker and didn't know it! Later on, I'd invent gutter helmets, vacuum sander, and several other things I probably could have retired from. Now I'm 69 and just Real Tired!
@DIYAudioGuy Жыл бұрын
😎
@Durolith2 жыл бұрын
pasive are just low space ports without chuffing
@DIYAudioGuy2 жыл бұрын
👍
@kerzwhile Жыл бұрын
I did Not know about the weights... What a great channel!! 😮😊
@DIYAudioGuy Жыл бұрын
Glad to be helpful.
@Bleats_Sinodai2 жыл бұрын
Hey I'm passive too
@projectsMASHchannel2 ай бұрын
But not that aggressive...
@charleshollingsworth15832 жыл бұрын
I have a pair of klh tower home stereo speakers that has passive radiators that i paid 120 bucks each new in 1989 and in college hooked to a vintage sx 780 pioneer reciever and a vintage akai cassette deck, nad now vintage cd player then i was jamming and these things sounded great for cheap. For 20 years i never knew they had passives until one of my crack head nephews was cranking the hell out of them and blew the tweets and 1 woofer. Upon dismantling them i found 2 of the 12 inch woofers to be passive. not wanting to throw them away i looked to parts express and reloaded them with 2 fresh goldwood 12 woofers and some dayton tweets adding tweeter protection bulbs. They still sound good, they have been moved all over the country, the cabinets are getting rough as they are presswood and have been in my shop for years. i have 3 shops on my property one for wood working, one for small engine repair and one for automotive repair and all 3 have stereo systems of vintage component/pa equipment from pawn shops, ebay etc with bluetooth dongles. Reading online from a stereo review article of old states that passive radiators were used by cheap speaker companies that they did not sound good and muffelled frequenciecs now they are making big returns in speakers.
@DIYAudioGuy2 жыл бұрын
That is awesome! Vintage gear is cool.
@artardFTW Жыл бұрын
so, what's better for rock and metal music? passive radiator box or just a single woofer in a sealed enclosure
@DIYAudioGuy Жыл бұрын
The conventional wisdom is that you want to use a sealed enclosure for that kind of music. I disagree with conventional wisdom. Ported boxes are louder so I'm going to go with the ported box if I can. Because of the additional cost of a passive radiator it's only practical when you have limited space for the enclosure.
@livemusic82482 жыл бұрын
I am an audiophile, i find iy fascinating, how a microphone can send sound through a cable to an amp, in turn through another cable, to a speaker that can separate, high frequencies down to low. Then one speaker company can sound realistic and another muddy, both use a cone, magnet and surround. In live music RCF, Myer, Adamson and L Acoustic and others are life like sound reproduction, and wont degrade the lesser manufactures. Then a home speaker has clarity yet only sound preproduction, while car stereos are more limited due to space. Music just gets me, how a signal is sent out and received by a receiver and one can be more sensitive example 9.3dB and another is 11.3 dB, then add stereo separation on and on. music is complex
@DIYAudioGuy2 жыл бұрын
I think it is cool how, if you look at an audio signal on a scope, it is a big scrambled mess of different frequencies all on top of each other. Yet a speaker can play that and we recognize it as sound. Simple and complex at the same time.
@raiden722 жыл бұрын
Polk audio also did passive radiators back in the 70s (Monitor 7 vintage from 1978)
@DIYAudioGuy2 жыл бұрын
OLD SCHOOL!
@robertsteel35632 жыл бұрын
My Panasonic SB-CH73 Speakers uses Passive radiators to be able to play frequencies from 22kHz all the way down to 40Hz!
@DIYAudioGuy2 жыл бұрын
Cool.
@headkase112 жыл бұрын
I have a sealed box with 6 12's 2 weeks later I saw the earthquake slap 12 passive on sale for $60 so I bought 3. I have one passive for every 2 subs and it has a fuller sound and plays a little deeper. I haven't messed with adding or subtracting weight on the passive cone. I'm waiting until I get my 5k amp to see how much they can handle. Right now my 6 12's are sharing 1200 Watts
@DIYAudioGuy2 жыл бұрын
Unless those passives have huge X-Max you don't have enough cone area. You're probably able to get away with it since you're not hitting your subs with the full 5,000 watts.
@TimpBizkit Жыл бұрын
Ideally you increase the enclosure size as well.
@headkase11 Жыл бұрын
@@TimpBizkit I added a story video with a little sound test.
@dash41912 жыл бұрын
Thank you learned something new. Not a wasted day.
@DIYAudioGuy2 жыл бұрын
Glad to hear it!
@glennjones6574 Жыл бұрын
Hmm. I see some rather large home soeskers with passives
@r3alfish2 жыл бұрын
I've known about passive radiatiors since I was a kid. I can't even find a picture online of what my dad had for his Silverado but he has 2 thin boxes with a 6.5 inch speaker that acted as a mids/lows speaker and a horn Tweeter on top of the box. The passive radiator was a flat foam piece with a foam surround. The box said "Stillwater Design's" on it as did the speakers inside. The passive radiator had Kicker embossed on the front of it. They sounded great on his Kenwood cassette deck! I would still have them and be able to do something with them had my mom's ex boyfriend not left them outside. 😑
@DIYAudioGuy2 жыл бұрын
Sounds like an original old-school box from kicker.
@r3alfish2 жыл бұрын
@@DIYAudioGuy they could have been 8 inch drivers, I can't recall for sure. I really wish that I still had them because I tried to look them up last night and couldn't find anything like them.
@r3alfish2 жыл бұрын
Also I was sleepy, the cassette deck was a Clarion with bright orange lights!
@HunterGamesCipri7 ай бұрын
Thank you, Sir!
@bogusphone80002 жыл бұрын
I still don't get how they work. In watching videos, they are often in the same plane and 180 degrees out of phase. If you take two drivers and wire them 180 out, you get reduced (or no) output.
@DIYAudioGuy2 жыл бұрын
It works the exact same way as a port. At some frequencies, the port and the driver are 189 out of face, at most frequencies. They're slightly out of phase. At the tuning frequency the port and the driver are in phase, but the port is one cycle behind. To drivers with reverse polarity are always out of phase at every frequency and therefore always offset each other.
@bogusphone80002 жыл бұрын
@@Mr.Robert1 Having thought about this a bit, it is the same as a port without the requirement for box volume. Depending upon the tuning, when you hit the right frequency range the Passive Radiator is aligned and amplifies the output. So, if someone wants a small enclosure, they can use a radiator instead of a port. I have a Harmon Kardon Bluetooth all on one. It has a passive radiator and 2x 3" woofers. It produces solid bass from a very small package. It isn't going to shake the walls, but it is full and rolls off smoothly.
@robsorgdrager84772 жыл бұрын
Now for dual iso-metric ( I think that's what it's called where two drivers face each other but are 180° faze so they act like one piston with twice the motor force ) . I also like how t lines make magic happen and folded horns are cool too.
@DIYAudioGuy2 жыл бұрын
Iso-baric! Great idea for a video. Have you seen this one? kzbin.info/www/bejne/eae4m4qErLV7erc
@robsorgdrager84772 жыл бұрын
@@DIYAudioGuy thank you good sir🖖. That was actually a pretty interesting build. I personally really like the ultimax line but for half the cost and like a 1/2-2/3 the power to get that loud and low and flat....really impressive.
@73Xtian2 жыл бұрын
The best thing about real isobaric is that you only need half the enclosure volume.
@808bigisland2 жыл бұрын
@@73Xtian no two drivers are alike. You will equalize two/four isobaric to no end. They sound smudgy.
@73Xtian2 жыл бұрын
@@808bigisland you're right about no two drivers being alike, but you're wrong about not getting it good and sounding 'smudgy'. Two drivers in normal configuration won't be the same either and it works perfect.
@theoriginaldonutdude495011 күн бұрын
If it serves as a port then why would some also include a port along with the passive radiator?
@deathstar13311 Жыл бұрын
Thanks! Great guy right here!
@DIYAudioGuy Жыл бұрын
Thank you very much.
@NemoPropaganda Жыл бұрын
Great discussion my man.
@DIYAudioGuy Жыл бұрын
Thanks!
@sterlingcampbell211614 күн бұрын
What? All this does is make your active speaker less loud? Is it supposed to trick the speaker into thinking it's in a bigger box?
@DIYAudioGuy14 күн бұрын
I think you need to watch the video again.
@randomtube82262 жыл бұрын
I like to use passive radiators with inverted active subs. With inverted subs I can wire directly to the subs and not have to worry about a terminal cup.
@DIYAudioGuy2 жыл бұрын
Clever!
@shrapnut76122 жыл бұрын
My brother has a pair of "ESS Heil," studio speakers that had passive radiators.
@tjaprilgage Жыл бұрын
good stuff man
@DIYAudioGuy Жыл бұрын
Thanks
@markeaton20032 жыл бұрын
The radiator output frequencies. would have to be 180 degrees out of phase from the driver, due to the action /reaction time of the driver relating to the radiator. Out of phase is not good, and loss of frequency. Speakers do not move the air as much as they vibrate it, that your ear receives.
@DIYAudioGuy2 жыл бұрын
It works just like a port. kzbin.info/www/bejne/o3m3eKp7fah2iNE
@georgemiller83292 жыл бұрын
Passives are less noisy or turbulent,also allow less mid frequency bleed out of port
@DIYAudioGuy2 жыл бұрын
Right, no port noise if there is no port.
@TimpBizkit Жыл бұрын
I should have done passive radiators in my subwoofers to stop the mice crawling in the ports and shitting inside them.
@DIYAudioGuy Жыл бұрын
LOL
@chuckmaddison29242 жыл бұрын
Probably the one that sticks in my mind is the Celestion Ditton.
@DIYAudioGuy2 жыл бұрын
Now that is old school right there!
@NemoPropaganda Жыл бұрын
Great vid brother!
@DIYAudioGuy Жыл бұрын
Thank you
@H0mework Жыл бұрын
Liked and subscribed! Great content!
@DIYAudioGuy Жыл бұрын
Welcome aboard!
@james107392 жыл бұрын
Some good info I was thinking about building a Bluetooth speaker and using one in it but it was just a thought I have put zero effort into that
@DIYAudioGuy2 жыл бұрын
You should consider a kit like this one. kzbin.info/www/bejne/maClg42MoK9gsKc
@Bobcat-19672 жыл бұрын
I learned some interesting stuff tonight.👍
@timvlogtv512 Жыл бұрын
your videos are quite informative and interesting, you earned my sub :) I'm planning to build some bookshelf speakers and im wondering if you sell any list or manual if that makes sense
@DIYAudioGuy Жыл бұрын
I do not, but I know someone that does. Check out Toids DIY audio. He has a ton of speaker plans available. Like these: kzbin.info/www/bejne/oojcfKd5Za2ibKs
@carcarjinks14302 жыл бұрын
i never understood why they don't cause phase cancellation, since the speaker is pushing the pr forward while it's moving backward
@ronwess2 жыл бұрын
Awesomeness 👌 just learned something today about passive radiator.... cool 😎 Thanks 4 this ("
@DIYAudioGuy2 жыл бұрын
You will probably like this video as well. kzbin.info/www/bejne/o3m3eKp7fah2iNE
@KalLanPIDT2 жыл бұрын
Very interesting, i had no idea that was a thing
@DIYAudioGuy2 жыл бұрын
Glad you liked it!
@juanvaldez40432 жыл бұрын
Drone cone sounds more fun!
@itekani Жыл бұрын
The passive radiator needs to displace double the volume. Ok, well that assumes you will use the full capacity of the speaker so if you are not looking to play 110db, maybe that's not true either?
@focuspocus97742 жыл бұрын
Jbl boombox speakers also have passive tiny subs but don't hit the low lows enough but still bassie enough
@DIYAudioGuy2 жыл бұрын
Yes.
@wesjacobson66752 жыл бұрын
Dude your videos are great! And you’re a funny guy! Excellent job at explaining things
@DIYAudioGuy2 жыл бұрын
I appreciate that!
@crazylarryjr2 жыл бұрын
For converting MM to CM, is as simple as simply moving the decimal left 1 place. Forexample lets say 11.. Xmax, to convert to CM quick and easy, simple move your decimal (invisible with 11mm) one place to show 1.1 CM. So your equation could be simplified by just saying 11MM is 1.1CM (no equation needed and simple do the rest of the equation as you dictated
@DIYAudioGuy2 жыл бұрын
That will work just as well.
@tableseven81332 жыл бұрын
Maybe I'm wrong but you could also use another driver not wired up as a drone as well, maybe that is where the two drone idea came from. 1 active and two not wired passive...
@DIYAudioGuy2 жыл бұрын
If the passive still has a magnet and a voice coil then it's going to generate an electromagnetic field. It's not going to behave in a predictable way so it would not make a good passive.
@tableseven81332 жыл бұрын
@@DIYAudioGuy Thanks for the reply but I still wonder about that since it is not wired up the coil, it should have no resistance. Now if it was hooked up to another amp or to a light bulb then the coil's generated electricity would create a resistances, and hamper the point of a free drone.
@titusm98376 ай бұрын
Just a crazy question - instead of using passive radiators how about normal speakers with a variable rezistor on the coil ( since you cannot tune with weights you can tune with passive rezistor). I was thinking about this since I have a few speakers that I do not use otherwise...but I could install them as passive ones.
@DIYAudioGuy6 ай бұрын
That's an interesting idea, I've never heard of anyone trying it. I have no idea how that would work or if it would work.
@MisterEE1002 жыл бұрын
Great video, thank you.
@DIYAudioGuy2 жыл бұрын
Thanks for watching.
@Roberto_Garcia_Ай бұрын
I have a 15 inch Sheffield Peavey 115 S Bass Amp that flutters when pushed. My concern is do I use a passive or a tube to maximize tuning of on board and frequency tuners because I'm scrap for cash and would rather solve solution of this unit which was dated back to 1994. I got this unit cheap but it was a once in a life time purchase.